MDB 

abbreviation for Masters in Douche-Baggery. Title is granted, normally in an honorary fashion, to an individual who displays a pompous attitude or pretends to know everything about everything. Also added to the end of a name, similar to other titles.

John was clearly using his MDB while working with a client the other day.

Just another lame move by John Q Public, MDB.

MDB by projectaristotle July 16, 2009

MDB 

Mega Douchebag -- when someone goes beyond just being the regular douchebag they normally are.

Brian from DcEvo: I was street racing last night w/ my kids in tha car fo sho!!!

Everyone else: What a MDB.

MDB by uh, no June 24, 2008

MDB 

Sexual term meaning to take a Mountain Dew Bath with someone. A fantasy to fill a tub with mountain dew(or another favorite beverage) and then share it with a partner.

That chick looks like she just got out of an MDB.

MDB by Jacob Tubbs May 26, 2008

MDB 

Morning. Drink. Bus. Commonly performed in Nashville, TN, the MDB is a rare specimen for brute aggressive alcoholism.

Yo let’s hit up the MDB tmw.

MDB by chiguy2024 December 10, 2021

MDB 

Mid-day bone

Random sex in the afternoon.

I don't have any classes the rest of the day, you up for a MDB?

All this working from home leaves plenty of time for a MDB!

MDB by Pmaracas June 23, 2023

MDB 

MDB is the universal warning acronym for a guy to alert another person that they may be close to engaging in a first time sexual encounter with that they have larger than average genitalia dimensions. MDB stands for "My Dick Big", which covers up to 10 inches, anything over ten and MDH, My Dick Huge, should be used as there is a big difference between a 7 inch one and a 10 and a half inch. Just think of a size 10 shoe and a size 13, or a size medium shirt and an XXL. Sometimes the acronym UDB, U Dick Big?, may be used proactively in which case the acronym, LGFO(Let's Go Find Out) can be used.

I just thought I should give you a heads up just in case you decide that you want to have sex with me. MDB..... "UDB?" Yep, MDB. "Not UDH?" No, no, not huge, just MDB.

MDB by SenorSauce February 17, 2025

MDB. 

MDB - Short term for Manic Depression Bipolar.

This is a long-term or a short term Illness, it can be treated by counciling, or medication.

Doctor: You have a common Illness named, MDB.

Person: Oh, Great!

Doctor: You have a common Illness named, MDB.

Person: Oh, Great!

MDB. by Mr Psychotic April 26, 2010